It sounds like you're happy with your current arrangement and don't want another child, and so you're not planning one. That sounds very reasonable to me
I really don't understand why anyone would have a child because they thought they 'should' for some reason. You have a child because you want one - that seems like the best reason to me, anyway.
I'm sorry to hear that you couldn't talk to anyone about your depression. I hope you are getting help and support for it now?